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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a0891781f2fd6a7f0b3333a6180f55609c0484ae465655991192a4b2479ce6' 
  AND token = 'J1g5BbXxvJ+Lyl634NsDP856dMo8Eh2XfINQljX9COU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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