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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edc0e89bd70b76fdd938696a7d69888852769153910dfa47bf1196be751ca52' 
  AND token = 'ffdHc0OTKIsDiyOI4EGnmtR4iUjvg8fhyJc4cp3A2Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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