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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01d276a93c824168f9a1485dc2e8d24df7364a1074406b4c0b98682e50373c6' 
  AND token = 'LXUCaI1e0Uw+dM8s9WW8ACoaI1yp8ee/KwJ3AgEab7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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