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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b3a47922c81a78aaba4e1af355f69ae77723d2b5c919f126e162ba5077aa2f' 
  AND token = 'hciFYb+z29cNpUzs9SMd10hYC6FT/pzdMbgrMTieFj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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