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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4d296b016ec3f9a46fcf98e5825887f975bbba184e060326b0b0c033e03ea5' 
  AND token = 'lKgPhcXuqN5lctSibsB1tmH4mpoPPb/YqfunpKM7tzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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