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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f6831640ceeb83fc8a764212d4991cb1c97b24748084fb690472651dc6c3e3' 
  AND token = 'jHFd0wnNKvlE1TrcYscywthQnG66hwBQ2g1Kx+hG4MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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