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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fed1dfb456e0fb36ce1917061dc27daf57a79853596b0030e17be63ebe4fa2' 
  AND token = 'vpDlyNLpapR1w/Nrb+mT7twNEij2hcnnybtrWyqIcZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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