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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a2bb17a526ece1853f82de5ad1dcf1aa19322e6bf1fc12d7415931888f102f' 
  AND token = 'ZGLseUab69Z25n41cR1G8TzkNIo4Y2lMXwGiZCGSXXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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