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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a51ca32872241fb5f95a73d71c2ee41b06823ae244d891bf972cd5259e140b' 
  AND token = 'y7Jo9Okrk7pCel8ln1f5AZoSOJHizBAq9/kkRTzu2i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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