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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e571275fa7061a6bc5dcebba584914d0c8b3acbc9297061bb23ef3aec3a3b8c' 
  AND token = '16B1fy39Mx/3OMddwCysy980qHPDRXbIrmdwm/ohTtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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