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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b4e388b9acd7c8c94ca528e6a5acc355a1154c55ed6765ede0e67a86ad4336' 
  AND token = 'R1k2uc+6Yob8T4F+ymcMIhRpfX/bdMniHRewRpdV7cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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