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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7827788b33dc9b7d54fc3407ccd4541b175eca45c2223a8b4044cf874ab227f4' 
  AND token = 'PFBOWW8OTqfTVfIw8yUc4763fbthtsKPlWY+j+sqJGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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