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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b180aa0f3b1a8ee408e83ec6ab2fc48ea5db8fa7298d083cd24624c798f948' 
  AND token = 'l5tkajSIftGbH76HSw1kKZHNMXEwxYbZuYy2IIsP2v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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