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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668ccba9e3603bb2b2d2c386be4928f95f1dc0e0b27065697c4a092dc2144346' 
  AND token = 'S/AINEPwURoRofFULC38MGbet9bKaW6QvC+Lx4skmRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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