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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3160215aea3ab46e430f3e71b2ea102d2de7e1cba509045a27d7e7385bdda546' 
  AND token = '0R9cDrfSVV0v+YLTWFB1kpAwrXHzW7c1PivPlttnf2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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