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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8028d078ee63aa6e3b48802cd657a47dbdf50db5b63d3b2c5f9615ba1442c4d' 
  AND token = 'r8GHxWeOYStjjPY4pjDi8coeQq5619APLIKUlS7R4Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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