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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ee3d11ae78312737436d9b1dda4c0f95570ec3e98f306d79c84461ab251981' 
  AND token = 'Cr+Wep1z5P4k3tBzHpmLF804NadZZqeC02TB3PtVunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}