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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574cef058011b12b8e7927b0b9834405b6c20d2538490985d8289f95da086014' 
  AND token = '1MTwR5jV9Gb8WhrYRiI9CgqCiPC9Jvv/aP3hS0GJ0gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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