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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab1926c114a08c1dac9aa8cc60bc82d18c413381fda0d2e46ad99b443d7d4ad' 
  AND token = 'wN3YC4/jVUUbvmh9/iglNpC2bxwQWL41i5lXF4tcSfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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